New to the boot game. Been doing a lot of research trying to figure out how to get this external drive to boot. I have a Mac Mini PPC G4 running OSX 10.3.8, and i'm trying to boot 10.3.9 from external USB. In system preferences, the mac recognizes the external drive and presents it as an option as a boot disk. However, it will not restart with this drive once I select it. Further, loading the machine holding OPTION only presents the internal drive as a bootable disk. When i use OpenFirmware (via this tutorial), i get this error message: "Warning: sector size mismatch!" When I run the same set of operations but this time using a different USB drive (with the same disk image as the other), I can boot initially, but then the Apple turns into a crossed-out circle and doesn't go any further. Any suggestions?